SAA7220 N.O.S Switch
N.O.S. adapterboard switch simple between OverSampling and Non Over Sampling.
- Switch between Over Sampling and Non Over Sampling
- Digital Output keeps working
- Muting keeps working
To perform a NOS modification truly correctly, you must also adjust the output filter.
Some Measurements
All These Measurements were at the output of a cd-player with and without the typical NOS modification.
Source Digital in 16 bits dithered frequentie. sweep 20Hz to 20kHz , -110 dB Philips low pass filter
Non oversampling is 1 dB or 2 dB more level depending on SAA7220p/A or SAA7220p/B
- Black NOS
- Red SAA7220 p/A
- Blue SAA7220 p/B
Level NOS and OS are both 0 dBfs is 0 dBref – Source Digital in 16 bits undithered frequentie. sweep 20Hz to 20kHz , AES 17 filter
White noise , 16 bits undithered , sample at 192kHz , FFT 1m 10x average
TDA1541A NOS versus OS with Philips -110 dB Low Pass Filter
NOS switch build in Le DAC “L1541DAC gold by Jesse
NOS board in Acram Alpha 5+
